Theory about Thancred
He's aging at an accelerated rate because he lost his magick. Some clues that stick out is for one we don't know how long Thancred had been scurrying around for but I don't think his hair should be as long as it is considering the amount of time that might of passed. Another clue is Hilda calling Thancred "Old" even though he would preffer to think of himself as "gritty", just lends itself to the idea that maybe Thancred losing his magick effected him in more ways that just not being able to cast spells. If anything does carry from 1.0, Thancred saved a young Minfillia in the flashback/echo scene of an Uldah festival that took place, and yet when we see him in present day he still looks the same while Minfillia has aged into a woman. It does seem weird how Thancred appears to have no physical difference from the day he saved Minfilla when she was but a child and how he is now and now compared to how he looks now. That's my guess though I mean when you consider the witch Matoya, pretty certain she's an old relic, the whole magic thing keeping you alive idea, would anyone really doubt Thancred using it for the sake of vanity?